package as.actions;


import javax.swing.JFileChooser;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.ISelectionService;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;
import org.eclipse.jface.dialogs.MessageDialog;

import ast.ASTGenerater;

/**
 * Our sample action implements workbench action delegate.
 * The action proxy will be created by the workbench and
 * shown in the UI. When the user tries to use the action,
 * this delegate will be created and execution will be 
 * delegated to it.
 * @see IWorkbenchWindowActionDelegate
 */
public class SampleAction implements IWorkbenchWindowActionDelegate {
	private IWorkbenchWindow window;
	private ASTGenerater astGen;

	/**
	 * The constructor.
	 * @throws CoreException 
	 */
	public SampleAction(){

	}

	/**
	 * The action has been activated. The argument of the
	 * method represents the 'real' action sitting
	 * in the workbench UI.
	 * @see IWorkbenchWindowActionDelegate#run
	 */
	public void run(IAction action) {
		IStructuredSelection struSel = getInfor();
		try {
			astGen = new ASTGenerater(struSel);
		} catch (JavaModelException e) {
			e.printStackTrace();
		}

		StringBuffer optMsg = new StringBuffer();
		
		if(astGen.isCUexist()){ 
			optMsg.append("Analysis target: \n" 
					+ struSel.getFirstElement().toString());			
		}else{
			optMsg.append("Please choose a target java element " +
						  "\n( a package folder or .java file)\n" +
						  "in PackageExplorer ");	
		}
			
		MessageDialog.openInformation(
			window.getShell(),
			"ASTaction Plug-in",
			optMsg.toString());
		
		
		

	}
	
	public IStructuredSelection getInfor(){
		ISelectionService service = window.getSelectionService();
		ISelection sel = service.getSelection();
		IStructuredSelection struSel = (IStructuredSelection) sel;		
		return struSel;
		
	}


	/**
	 * Selection in the workbench has been changed. We 
	 * can change the state of the 'real' action here
	 * if we want, but this can only happen after 
	 * the delegate has been created.
	 * @see IWorkbenchWindowActionDelegate#selectionChanged
	 */
	public void selectionChanged(IAction action, ISelection selection) {
	}

	/**
	 * We can use this method to dispose of any system
	 * resources we previously allocated.
	 * @see IWorkbenchWindowActionDelegate#dispose
	 */
	public void dispose() {
	}

	/**
	 * We will cache window object in order to
	 * be able to provide parent shell for the message dialog.
	 * @see IWorkbenchWindowActionDelegate#init
	 */
	public void init(IWorkbenchWindow window) {
		this.window = window;
	}
}